A new type of antimycin analogs, (3S, 4R, 15S)-4,15-dimethyl-l,5-dioxa-3-(3′-formamidosalicylamido)-cyclopentadecane-2,6-dione (10a) and its (15R)-epimer (10b) have been synthesized. The epimeric fifteenmembered amino-dilactone moieties in 10a and 10b were synthesized from a masked l-threonine and t-butyl Dl-10-hydroxyundecanoate. Each of the separated epimeric amino-dilactones was N-acylated with O-benzyl-3-nitrosalicylic acid N-hydroxysuccinimide ester. Hydrogenation followed by N-formylation afforded the anti-fungal substances,10a and 10b. The 10-C-configurations of 10a and 10b were determined as “S” and “R”, respectively. The (15S)-epimer (10a) showed apparently stronger antifungal activity against Piricularia oryzae than that of the (15R)-epimer (10b).
一种新型
抗霉素类似物--(3S, 4R, 15S)-4,15-二甲基-l,5-二氧杂-3-(3′-甲酰
氨基
水杨酰
氨基)-
环十五烷-2,6-二酮(10a)及其(15R)-表二聚体(10b)被合成出来。10a 和 10b 中的 15 元
氨基二内酯二聚体是由掩蔽的 l-苏
氨酸和 Dl-10-羟基
十一酸叔丁酯合成的。分离出的每种二元
氨基二内酯都与 O-苄基-3-亚硝基
水杨酸 N-羟基琥珀
酰亚胺酯进行 N-酰化。氢化后再进行 N-甲酰化,就得到了抗真菌物质 10a 和 10b。10a 和 10b 的 10-C 构型分别被确定为 "S "和 "R"。(15S)-表聚物(10a)与(15R)-表聚物(10b)相比,明显具有更强的抗真菌活性。